Pretty much every company I’ve been in or know of values a vertical trajectory instead of a horizontal one for its employees i.e becoming a manager nearly always means a faster salary progression than becoming an expert in one or multiple fields.
Why is expertise valued less?
All your examples involve teams, and teams don’t typically happen without some form of leadership from someone. An expert without leadership skills will be far less effective at building a team around them than someone with the expertise and the leadership skills.
The expert your describing in your last paragragh IS a leader. If they aren’t being compensated as such, thats just them being exploited, and they need to advocate for more appropriate compensation.